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| Orbit of the Moon ： ウィキペディア英語版 |
Orbit of the Moon
:''Not to be confused with Lunar orbit (the orbit of an object around the Moon).
The Moon orbits Earth in the prograde direction and completes one revolution in approximately 27.322 days (a sidereal month). Earth and the Moon orbit about their barycentre (common center of mass), which lies about km from Earth's center (about three quarters of the radius of Earth). On average, the Moon is at a distance of about km from Earth's center, which corresponds to about 60 Earth radii. With a mean orbital velocity of 1.022 km/s,〔(【引用サイトリンク】 title= Moon Fact Sheet )〕 the Moon moves relative to the stars each hour by an amount roughly equal to its angular diameter, or by about 0.5°. The Moon differs from most satellites of other planets in that its orbit is close to the plane of the ecliptic, and not to Earth's equatorial plane. The plane of the lunar orbit is inclined to the ecliptic by about 5.1°, whereas the Moon's spin axis is inclined by only 1.5°.
== Properties ==
The properties of the orbit described in this section are approximations. The Moon's orbit around Earth has many irregularities (perturbations), whose study (lunar theory) has a long history.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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